Concrete-step form



J. SOULE ET AL 1,787,799 I CONCRETE STEP FORM Filed June 17, 1929 Jan. 6, 1931.

gmemtow #752 5004: fawn/04o 7/6/24 5 :p ng'an in the invention thereon.

Patented 6; 1931 corn, REIN'HQLD rIEFmAND EDWARD WALS QQF n-ENvER, coLo R'Ano 1 cononE'rE-smr FORM I I .rp ncatan' ndma 17, This inventionjre'lates to what is common- 1y known as a step'jack,-thatis, a device for,

hold ng riser boards in place while pourlng concrete stepsand stalrs.

The principalobject of the invention'is toprovide a device ofthis character which canbe quickly and easily adjusted to' accomfmodate' steps-'of'any desired height ofrisero and'width of'treadg "Another object oif the invention is to providea simplified construction in'which a single clamp's'c rew'will maintain 'thejack in pof sition upon a supporting stringer and secure the riser bbardtheretO'. Y 7

Other objects and advantages reside in the, detailconstrtlctionof the invention, which is designed for-simplicity, economy, andeifi- Hciency. These will become more apparent from the following description. j

In the following detailed description of the invention reference is had to' the accom- 1 panying'drawingwhich forms a part hereof. IJike numerals refer to like parts'in 2111 views of the drawing and throughout the fdescri'ption. o In the drawing: r

Fig; 1 is a side elevation of a supporting 1 stringer illustrating .thesuccessive steps of- .1, Fig. 2 is a perspective view illustrating the improved jackinuse. I i

,Fig. 3 .is vertical section taken onthe line 33,Fig.2.. I

iFig. 4 is a. horizontal section through the [jack taken on the line 4-4:, Fig. ,3.

The j ack is designed for use with a timber stringer such as illustratedat 22 and: wooden riser. boards 25.

The improved jack comprises afohannel iro nleg member 10 whichterminatesat its lower extremityin, a forwardly projecting foot 11 The forward extremity of the foot 11 is provided with'upwardly turned flanges v: 28 for engaging andholding a riser board 25. A slide member12 is slidably mounted upon the leg 10. At one side of the slide member 12, ears' 21 project to engage the upper edgejof a riser board 25. A jack screw 1 3 is provided with a head 26 to preventits of the clamp blockf16. Theextremities 0f.

of theleg. 2

draws parallel' diagonal :line'salong the 1929. Serial Nfo; 371,396.

withdrawal throughthe ear 14: and is thread- '7 member 12.

. v,At each side of thebushing'. 15 in the j clamp block.16 vertical. channels are formed, in each ofwhich a-clamp hook17 isslidably carried. One of the clamp hooks 17 extends out of the upper endxof theclamp block 16 and passes through a slidable guide 18 upon the leg 10 which acts to maintain the. clamp block-uprighton .theleg 10. The other clamp hook 17 projects from the bottom extremity both clamp hooks 17 are provided with inwardly turned points 19. Each of the hooks 217. is provided with a projection 31 which travels ina groove 32 in the clamp block '16 and limits themovement of-the hooks 17 -and" prevents their withdrawal fromthe block 16. A pin 20 is passed through the leg lOi at its upper extremities to prevent the slides 12 and 18 from passing off the upper extremity h I In us ng the invention the mechanic se- I lects a stringer preferably a two by four timber, such as illustrated at 22 He then places his square upon the stringer 22' as illustrated at .23, so thatthe rise of the desired stepsis laid off on one leg of the square and the tread of the desired steps is laid off on the other leg thereof. l/Viththeisquare' in this position he stringer such as indicated at 24c; spaced apart 5 the width of the desired-tread. series of riserfbo'ards 25 are now prepared -eachhaving a width equal tothe rise of the desired stairs.

'Thestep ;jacks are now placed on the "stringer 22 so that the forwardedge of each leg 10"1ies" along one or thelines- 24c. 'A riser board 'isp'laced on the foot 11 and the leglO "drawn upwardly tjo firmly clamp the riser board against the ears 21. The clamp hooks 17 areforced downwardly and upwardly re spectivelyyto engage the upper and lower edges of the stringers 22and'the jack screw 13 isv tightened. In tightening, the jack "will'be forced against the leg so as tofirm ly lock itinthe slidefmember 12. I

' itselftofboth the" stringer 22" and the"riser" a board 25. Sufficient jacks are employednto' It noted that the ti hten-ing of jack screw 13 served to lock all of ,theconr. ponent parts of the jack and to lock the jack maintain a riser board for each or the desired steps. For the usual-zwidth of step two of the stringers 22 will be Sllfl'lClGIlt with a wjackiiat each extremitydof each '1 riser board.

Eor wider steps an additionalstringer mayi -1ibe;@placed' to isu-pport ithezimideportioni of the "triseriboands' I If it is desired sirlnorei firmlyim-position anailxmay driven into their: upperedges'throughlzopenings 27 1:29 swhichf forceiintothef; stringer to eprevent provided forvzithat purpose*rintthe Years '21.

.LTheiface ofthe slidefmembers 12 which engage the stringerF-2'2; ares-providediwith teeth ithe". slide members fronrturning thereon.

' When the-riser'boardsiare rinplace the con- I" cretei is filled in between them aup to their ='While.a=spec1fic 1Eorm"'of'the improvement has -been described and illustrated herein, it

iisid'esired to beunderstood that theasame may be varied; within the scope" of thezappended scla ims; withouti -departing'"from the spirit'of ":thelinrention. -1 V isclaimedan'didesi'redsecured'by' Letters Patentiszv 1.1::A1: step jack comprising a; leg; a foot iHd-j acent' thelower'extremity' of J said' fleg ar- '7 *rangedto support a riserboard ;'a slide mem- Jber: on- SELlCl' leg means on said slide member Iforiengagingsaid riser :board imeans, for at-' I "taching said ask. to .(I'T supporting member,

.csaidzineans comprisingi azjackscrew project- "angfrom said slide? member a; clamp block threaded on said q'aoksorew;;zclarnp armsexae dmgrmm said". clampblockandarranged to engage said supporting memberi; .a slid- "able guide mounted on said leg, one of said clamp ehooks passing throughsaid slidable guide so as to maintain said clamp block up- ;right thereon. Y

2." A- step jackcomprisi-ng: a slide member;

1 7 an ear projecting from saidslide member and arrangedto engage the upper edge of a riser board; a-. leg slidably mounted in said slide;

a foot,on'thelower-extremity of said leg arranged toenga-ge the lower edge of said rlser board; clamp arms; vand means for causing i said .clamparms. to draw said slide against a .-v supporting. member. Y

A step ack comprisingifa slide m emto hold the niseri iboards :upp'er'; edgesrtoilformi ttreads as indicated ried.

ber; an ear projecting from said slide mem- 7 her and arranged to engage the upper edge of a riser board; a leg slidably mounted in said slide; afoot on the lower extremity of said leg arranged to engage the lower edge of said 70 riser board; clamp arms; and means for causing. said clamp armstoldraw-said slide against iaz'supporting t member,i said means comprising: a clamp block in which said clamp hooks are maintained and ajack screw 75 arrangedto force said clampblo'ck-awa'y from said slide so as to cause said hooks to draw .said 'sli'de against said supportingmember.

4, A stepijack eornprisingz a slide member;

an ear projecting from said slide member and 30 arranged 'to'engag'e the upper edgeotia riser -board;,:a legx'slidably mounted in saidzslide; affoot on the lower extremity of said legsarranged to engage theloweredgeof said riser board; clamp armsy-andrneans for causing.

said clamparms to d-raw-said slide iagainst ia supportingimemberf,:said means X comprising a clamp block in whichssaid clamp hoeksiare maintained and a jack screw rearranged $130 force said: olampzblock awayQirom said fislidexrpo so as tocause -said "hooks todrawmardmlide 1 against said supporting "member; saidclaznp a'hooksbeing'slidably mounted in said clamp block so that their distance apart maybe va- 5 I 'p 5; A step 'jack comprising zwaz-slide memfber an ear projecting;5fr0n1=said s'hde lmember and arranged to: engage: the iuppereedge of a riser board;: a -1e .sl-idably.=mountedt1n said 5 slide a foot :on the lowersextremi-ty of 5 said leg arranged to engage the: lower edge 7 v of said riser hoard; clampanng-animeans T -Having thus-described the'in-ventiom'whatfi for-causing said clamp-Harms to draw said slide against a -supporting member,;wsaid means comprising: a clamp b1ock-:in--which- -1o5 said clamp hooks are maintained-and a jack screw arranged to force said clamp sblock away'from saidslide soas to cause said-hooks todraw said slide againstssaid supporting mounted in said clamp blockrso that their distance apart maybe rvaried; and means "for preventing said clamp hooks: from being withdrawn fromsaidvblock. V

6. A step-jack to" bemused in combination 11 V with a stringer member and :a: riser .board comprising 2 a slide member arranged to engage one face of said stringer member and .7 one edge of said riser board; a leg slidably gage one face of said stringer member and' member, said clamp hooks being sli'dably V one edge of said riser board; leg slidably mounted in said slide member; a foot on said leg arranged to engage the other edge of said riserboard; clamp hooks'arranged to en age the Opposite face of'said .stringer mem er;

means for forcing said clamp hooks and said 'slide member against saidstringer member,

said means comprising: a clamp block; a

jack screw supporting said clampblock from said slide; said clamp hooks being mounted in said clamp block so that rotationof said EDWARD WALSH.

ack screw will cause said hooks to clamp said 

